I own a Kubota BX Sub-Compact Tractor, and I was looking for a more cost effective option for the engine air filter which is an expensive replacement from Kubota. I own a K&N filter for my motorcycle, however diesel engine air filters cannot use an oil soaked element so I wasn't sure that K&N offered a filter compatible with diesel engines. I searched your website and found exactly what I was looking for which was an oil free synthetic element filter exact replacement for my Kubota. The element quality is top notch and actually seals better and tighter than the OEM filter, and the best part true to K&N design, is its totally cleanable so I'll never have to buy another air filter for my tractor again. Thanks very much K&N.